diff --git a/src/rm_auto_aim/armor_detector/src/armor_pose_estimator.cpp b/src/rm_auto_aim/armor_detector/src/armor_pose_estimator.cpp
index e0ee969..044dfcc 100644
--- a/src/rm_auto_aim/armor_detector/src/armor_pose_estimator.cpp
+++ b/src/rm_auto_aim/armor_detector/src/armor_pose_estimator.cpp
@@ -19,6 +19,9 @@
 #include "rm_utils/math/utils.hpp"
 
 namespace fyt::auto_aim {
+
+// Forward declaration for forceRPY
+Eigen::Matrix3d forceRPY(const Eigen::Matrix3d& R, double forced_roll_deg, double forced_pitch_deg);
 ArmorPoseEstimator::ArmorPoseEstimator(sensor_msgs::msg::CameraInfo::SharedPtr camera_info) {
   // Setup pnp solver
   pnp_solver_ = std::make_unique<PnPSolver>(camera_info->k, camera_info->d);